#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    while (scanf("%d %d %d\n", &a, &b, &c) != EOF)
    {
        if (a == b && b == c)
        {
            printf("Equilateral triangle!\n");
            continue;
        }
        if ((a + b > c && a + c > b) && b + c > a)
        {
            if ((a == b || a == c) || b == c)
            {
                printf("Isosceles triangle!\n");
                continue;
            }
            printf("Ordinary triangle!\n");
            continue;
        }
        printf("Not a triangle!\n");
    }
    return 0;
}